The patch has helped me. My process used to fail at either
1) assigning a document to t a user, or
2) rendering the final approved PDF and add the original attachments.

I haven't done extensive testing yet, but since applying the patch I
have not seen any failures of type 1). If I don't add the attachments
at point 2), it completes ok.

I'm currently trying to rewrite my process so that I render the
final PDF with the original attachments at the beginning of the
process, and then just import the proper data into the PDF at the
end of the process.

We are facing the exact same problem. We are using LC 8.01. Adobe provided us QF 2.57 but no luck. Did your problem is fixed. If yes please let me know what you did. We trying to fix it from last 6 months. Please help me.

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